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Convert to CNF Step 3: Standardize Variables If two variables have the same name, then change the name of one of the variables (no modification in this example)

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Convert to CNF Step 4: Skolemization “Skolemization” – the process of removing existential quantifiers by elimination. General Rule: Arguments of the skolem function are all the universally quantified variables in whose scope the existential quantifier appears.

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Convert to CNF Step 5: Drop Universal Quantifiers Pretty Easy…

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Convert to CNF Step 6: Apply Distributivity Nothing much to do in this example…but you know how to do this well after problem 1.

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Assert Negation of Conclusion What we want to conclude: Negation of conclusion: